---
title: SRPhotoplethysmogramOpticalSample.NoiseTerms
framework: sensorkit
role: symbol
role_heading: Structure
path: sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.struct
---

# SRPhotoplethysmogramOpticalSample.NoiseTerms

The mathematical terms that you use to compute the photoplethysmogram (PPG) noise.

## Declaration

```swift
struct NoiseTerms
```

## Topics

### Accessing noise terms

- [whiteNoise](sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.struct/whitenoise.md)
- [pinkNoise](sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.struct/pinknoise.md)
- [backgroundNoise](sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.struct/backgroundnoise.md)
- [backgroundNoiseOffset](sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.struct/backgroundnoiseoffset.md)

## See Also

### Accessing optical data

- [emitter](sensorkit/srphotoplethysmogramopticalsample/emitter.md)
- [activePhotodiodeIndexes](sensorkit/srphotoplethysmogramopticalsample/activephotodiodeindexes.md)
- [signalIdentifier](sensorkit/srphotoplethysmogramopticalsample/signalidentifier.md)
- [nominalWavelength](sensorkit/srphotoplethysmogramopticalsample/nominalwavelength.md)
- [effectiveWavelength](sensorkit/srphotoplethysmogramopticalsample/effectivewavelength.md)
- [samplingFrequency](sensorkit/srphotoplethysmogramopticalsample/samplingfrequency.md)
- [nanosecondsSinceStart](sensorkit/srphotoplethysmogramopticalsample/nanosecondssincestart.md)
- [conditions](sensorkit/srphotoplethysmogramopticalsample/conditions.md)
- [SRPhotoplethysmogramOpticalSample.Condition](sensorkit/srphotoplethysmogramopticalsample/condition.md)
- [noiseTerms](sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.property.md)
- [normalizedReflectance](sensorkit/srphotoplethysmogramopticalsample/normalizedreflectance-15f2k.md)